Machine Tool Terms PDF

A machine tool used in the production of flat surfaces on pieces too large or too heavy or perhaps too awkward to hold in a shaper Planer It consist of shaping a piece by bringing it into contact with a rotating abrasive wheel Grinding A tool used in measuring...

A machine tool used in the production of flat surfaces on pieces too large or too heavy or perhaps too awkward to hold in a shaper Planer It consist of shaping a piece by bringing it into contact with a rotating abrasive wheel Grinding A tool used in measuring diameters Caliper Used to true align machine tools, fixtures, and works, to test and inspect trueness of finished work, and to compare measurement either heights or depths or many other measurement Dial Indicator The ability of the metal to be deformed considerably without rupture Plasticity The shop term used to include the marking of inscribing of center points, circle, arcs, or straight line upon metal surfaces, either curved or flat, for the guidance of the worker Laying Out An operation of sizing and finishing a hole by means of a cutting tool having several cutting edges  Reaming ( ͡° ͜ʖ ͡°) The operation of making a cone shaped enlargement of the end of a hole, as for a recess for a flat head screw Countersinking The operation of enlarging a hole by means of an adjustable cutting tool with only one cutting edge Boring An imaginary circle passing through the points at which the teeth of the meshing gears contact each other Pitch Circle A type of bolt for use in bolting wooden parts together or wood to metal,. It has a portion of shank just underneath a round head, which is designed to keep the bolt from turning in the wood when the nut t tightened Carriage Bolt  The number of teeth per inch of pitch diameter and which gives some indications of the gear teeth Diametral Pitch The distance from the center of one tooth of a gear the center of the next consecutive tooth measured of the pitch Circular Pitch The portion of the gear tooth that projects above or outside the pitch circle Addendum  The portion of the gear tooth space that is cut below the pitch circle and is equal to the addendum plus the clearance Deddendum When meshed with a gear it is used to change rotary motion to reciprocating motion Gear Rack A kind of gears for heavy duty works where a large ratio of speed is required and are extensively used in speed reducers Worm Gear A kind of gear to transmit motion from one shaft to another shaft at an angle to the first Bevel Gear The uniform heating of steel above the usual hardening temperatures, followed by cooling freely in air Normalizing The operation of cooling a heated piece of work rapidly by dipping it in water, brine or oil Quenching  A method in softening a piece of metal that is too hard to machine and is done by heating steel slowly above the usual hardening temperature keeping it at the heat for ½ to 2 hours then cooling slowly, preferably in a furnace Annealing The total permissible variation in the size of a dimension the difference between the limits of size Tolerance  The operation of machining the end of a work piece to make the end square with the axis Squaring The clearance between the tooth profiles of a gear tooth Backslash A mechanism which usually do the indexing in a machine tool Dividing Head A material that can wear away a substance softer than itself Abrasive  A cylindrical bar of steel with threads formed around it and grooves or flutes running lengthwise in it, intersecting with the threads to form cutting edges. It is used to cut internal threads Tap A set of gages consisting of thin strips of metal of various thickness mounted in a steel case or holder and is widely used for measuring and checking clearances Feeler Gage A machine tool which is very similar to a shaper except that the ram reciprocates vertically rather than horizontally Slotter A machine tool principally to machine flat or plane surfaces with single -point cutting tool Shaper A kind of bolts which has no head an instead has threads on both ends Stud Bolts A kind of chuck which has a reversible jaws which could be adjusted separately Independent Chuck  A tool which when pressed into finished hole in a piece of work, provides centers on which the piece may be turned or otherwise machined Mandrel A kind of chuck which should not used where extreme accuracy is required Universal Chuck  The process of checking or producing checkers on the surface of a piece by rolling checkered depression into the surface Knurling  Its fits the main spindle of a lathe and is so called because its acts as a bearing surface on which the work rest. It revolves with the work. When compared with the hardness of the dead center in the tailstock, is usually soft, and is so made since it does not work Live Center A gripping device with two or more adjustable jaws radially Chuck Steel Balls for ball bearings are manufactured by Cold Heading Addendum of a cycloidal gear tooth Epicycloids In a lathe, it comprises the main spindle, the necessary mechanism for obtaining the various spindle speed and also certain gears which are used to operate the quick change gear mechanism Headstock A soft yellow metal, known since ancient times a precious metal which values are based. Gold  The operation of cooling a heated piece of work rapidly by dropping it in water, brine or oil. Quenching A device used to prevent leakage of media. Seal A welding operation in which a non -ferrous filler metal melts at a temperature below that of the metal joined but is heated above 450 degree Celsius. Brazing  The process of working metals by the application of sudden blows r by a steady pressure Forging The process of producing a variety of surface by using a circular type cutter with multiple teeth. Milling  The softening of meals by heat treatment and most commonly consists of heating the metals up to near molten state cooling them very slowly. Annealing The maximum stress induced in a material when subjected to alternating or repeated loading without causing failure. Endurance limit The total deformation measured in the direction of the line of stress. Strain The maximum stress to which a material can be subjected without a trace of any permanent set remaining upon a complete withdrawal of the stress Elastic Limit The ability of metal to withstand without breaking down is: Strength A machining operation whereby the tool reciprocates and the feed is stationary is called: Shaping  Any material that retards the flow of electricity used to prevent passage or escape of electric current from conductors. Insulators A metallic element and the only metal that is liquid at ordinary temperature Mercury An alloy of cooper and zinc. Brass Usually a copper - tin alloy is: Bronze A tool with hardened points used for scribing circles or laying of distances. Divider  Name of mechanism which a welding operator holds during gas welding and at the end of which the gases are burned to perform the various gas welding operations. Torch The maximum stress to which a material may be subjected before failure occurs. Ultimate stress The maximum stress induced in a material when subjected to alternate or repeated loading without causing failure. Endurance point In standard coarse thread bolt, the stress concentration is maximum at: Root Which of the following ropes are more flexible? 6 by 37 Tools usually used in wood pattern making in foundry shop. Saws and Chisels  Type of bolt commonly used in the construction that is threaded in both ends. Stud bolt Cast iron flywheels are commonly designed with factor of safety of: 10 to 13 Which of the type of chain is used in motorcycle? Brush Roller Spiral gears are suitable for transmitting: Small Power The type of cam used for low and moderate speed engines is generally: Harmonic Gears for wrist watches are generally manufactured by: Stamping The rated life of a bearing changes: Inversely as cube of load The best material for brake drum is: Cast iron An elastic body whose primary function is to deflect under load. Spring Which one is different from the remaining? Electroplating Splines are used when: The power transmitted is low Axial relative motion between shafts and hub is necessary Delta iron occurs at temperature of: Between 1400˚C and 1539˚C  The most important element that controls the physical properties of steel is: Carbon The process commonly used for thermo -plastic material is: Injection Molding Select the one that has highest specific gravity: Lead Age - hardening is related with: Duralumin Ratio of pitch diameter to the number of teeth. Module  How do you call a cam where in the follower reciprocates or oscillates in a plane parallel to its axis? Cylindrical Cam How are gears for watches generally manufactured? Stamping Rope brake dynamometer uses what? No lubricant Which of the following could be the effect of cold working? Increases the fatigue strength In testing a material for endurance strength, it is subjected to: Completely reversed load Coaxing is the procedure of increasing: Fatigue limit by overstressing the metal by successively increasing loadings Up to what percent thickness of plate, edge preparation for welding is not needed? 4 mm Arc blow takes place in: Welding stainless steel What is the function clutch in the machine tool? To connect shaft so that the driven shaft will rotate with the driving shaft and to disconnect them at all  The height of tooth above the pitch circle or the radial distance between pitch circle and top land of the tooth. Addendum How do you call the distance of the tooth which is equal to the sum of the addendum and deddendum? whole depth A cold chisel is made of what? High Carbon Steel It is the ability of a material to absorb energy when deformed elastically and return it when unloaded. Resilience Which of the following cams where the follower reciprocates or oscillates in a plane parallel to the axis of rotation? Cylindrical Cam Which of the following cams where the follower reciprocates or oscillates in a plane perpendicular its axis of rotation? Radial Cam During tensile test, which of the following stress -strain curve(s) fits for a glass rod? a sudden break In case of a knuckle joint, the pin is most likely to fail in: Double Shear  A single ply leather belt running at a belt velocity of 300 ft/min is likely to transmit per inch of width: 4.0 Hp  How do you call a body having identical properties all over? Homogeneous  How is the material described if it recovers its original dimensions when the load is removed? Elastic